<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html lang="en">
<head>
<title>Source code</title>
<link rel="stylesheet" type="text/css" href="../../../../../../stylesheet.css" title="Style">
</head>
<body>
<div class="sourceContainer">
<pre><span class="sourceLineNo">001</span>package org.apache.commons.net.ntp;<a name="line.1"></a>
<span class="sourceLineNo">002</span>/*<a name="line.2"></a>
<span class="sourceLineNo">003</span> * Licensed to the Apache Software Foundation (ASF) under one or more<a name="line.3"></a>
<span class="sourceLineNo">004</span> * contributor license agreements.  See the NOTICE file distributed with<a name="line.4"></a>
<span class="sourceLineNo">005</span> * this work for additional information regarding copyright ownership.<a name="line.5"></a>
<span class="sourceLineNo">006</span> * The ASF licenses this file to You under the Apache License, Version 2.0<a name="line.6"></a>
<span class="sourceLineNo">007</span> * (the "License"); you may not use this file except in compliance with<a name="line.7"></a>
<span class="sourceLineNo">008</span> * the License.  You may obtain a copy of the License at<a name="line.8"></a>
<span class="sourceLineNo">009</span> *<a name="line.9"></a>
<span class="sourceLineNo">010</span> *      http://www.apache.org/licenses/LICENSE-2.0<a name="line.10"></a>
<span class="sourceLineNo">011</span> *<a name="line.11"></a>
<span class="sourceLineNo">012</span> * Unless required by applicable law or agreed to in writing, software<a name="line.12"></a>
<span class="sourceLineNo">013</span> * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.13"></a>
<span class="sourceLineNo">014</span> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.14"></a>
<span class="sourceLineNo">015</span> * See the License for the specific language governing permissions and<a name="line.15"></a>
<span class="sourceLineNo">016</span> * limitations under the License.<a name="line.16"></a>
<span class="sourceLineNo">017</span> */<a name="line.17"></a>
<span class="sourceLineNo">018</span><a name="line.18"></a>
<span class="sourceLineNo">019</span>import java.net.DatagramPacket;<a name="line.19"></a>
<span class="sourceLineNo">020</span><a name="line.20"></a>
<span class="sourceLineNo">021</span>/***<a name="line.21"></a>
<span class="sourceLineNo">022</span> * Implementation of NtpV3Packet with methods converting Java objects to/from<a name="line.22"></a>
<span class="sourceLineNo">023</span> * the Network Time Protocol (NTP) data message header format described in RFC-1305.<a name="line.23"></a>
<span class="sourceLineNo">024</span> *<a name="line.24"></a>
<span class="sourceLineNo">025</span> * @author Naz Irizarry, MITRE Corp<a name="line.25"></a>
<span class="sourceLineNo">026</span> * @author Jason Mathews, MITRE Corp<a name="line.26"></a>
<span class="sourceLineNo">027</span> *<a name="line.27"></a>
<span class="sourceLineNo">028</span> * @version $Revision: 1489361 $<a name="line.28"></a>
<span class="sourceLineNo">029</span> */<a name="line.29"></a>
<span class="sourceLineNo">030</span>public class NtpV3Impl implements NtpV3Packet<a name="line.30"></a>
<span class="sourceLineNo">031</span>{<a name="line.31"></a>
<span class="sourceLineNo">032</span><a name="line.32"></a>
<span class="sourceLineNo">033</span>    private static final int MODE_INDEX = 0;<a name="line.33"></a>
<span class="sourceLineNo">034</span>    private static final int MODE_SHIFT = 0;<a name="line.34"></a>
<span class="sourceLineNo">035</span><a name="line.35"></a>
<span class="sourceLineNo">036</span>    private static final int VERSION_INDEX = 0;<a name="line.36"></a>
<span class="sourceLineNo">037</span>    private static final int VERSION_SHIFT = 3;<a name="line.37"></a>
<span class="sourceLineNo">038</span><a name="line.38"></a>
<span class="sourceLineNo">039</span>    private static final int LI_INDEX = 0;<a name="line.39"></a>
<span class="sourceLineNo">040</span>    private static final int LI_SHIFT = 6;<a name="line.40"></a>
<span class="sourceLineNo">041</span><a name="line.41"></a>
<span class="sourceLineNo">042</span>    private static final int STRATUM_INDEX = 1;<a name="line.42"></a>
<span class="sourceLineNo">043</span>    private static final int POLL_INDEX = 2;<a name="line.43"></a>
<span class="sourceLineNo">044</span>    private static final int PRECISION_INDEX = 3;<a name="line.44"></a>
<span class="sourceLineNo">045</span><a name="line.45"></a>
<span class="sourceLineNo">046</span>    private static final int ROOT_DELAY_INDEX = 4;<a name="line.46"></a>
<span class="sourceLineNo">047</span>    private static final int ROOT_DISPERSION_INDEX = 8;<a name="line.47"></a>
<span class="sourceLineNo">048</span>    private static final int REFERENCE_ID_INDEX = 12;<a name="line.48"></a>
<span class="sourceLineNo">049</span><a name="line.49"></a>
<span class="sourceLineNo">050</span>    private static final int REFERENCE_TIMESTAMP_INDEX = 16;<a name="line.50"></a>
<span class="sourceLineNo">051</span>    private static final int ORIGINATE_TIMESTAMP_INDEX = 24;<a name="line.51"></a>
<span class="sourceLineNo">052</span>    private static final int RECEIVE_TIMESTAMP_INDEX = 32;<a name="line.52"></a>
<span class="sourceLineNo">053</span>    private static final int TRANSMIT_TIMESTAMP_INDEX = 40;<a name="line.53"></a>
<span class="sourceLineNo">054</span><a name="line.54"></a>
<span class="sourceLineNo">055</span>//    private static final int KEY_IDENTIFIER_INDEX = 48;<a name="line.55"></a>
<span class="sourceLineNo">056</span>//    private static final int MESSAGE_DIGEST = 54; /* len 16 bytes */<a name="line.56"></a>
<span class="sourceLineNo">057</span><a name="line.57"></a>
<span class="sourceLineNo">058</span>    private final byte[] buf = new byte[48];<a name="line.58"></a>
<span class="sourceLineNo">059</span><a name="line.59"></a>
<span class="sourceLineNo">060</span>    private volatile DatagramPacket dp;<a name="line.60"></a>
<span class="sourceLineNo">061</span><a name="line.61"></a>
<span class="sourceLineNo">062</span>    /** Creates a new instance of NtpV3Impl */<a name="line.62"></a>
<span class="sourceLineNo">063</span>    public NtpV3Impl()<a name="line.63"></a>
<span class="sourceLineNo">064</span>    {<a name="line.64"></a>
<span class="sourceLineNo">065</span>    }<a name="line.65"></a>
<span class="sourceLineNo">066</span><a name="line.66"></a>
<span class="sourceLineNo">067</span>    /***<a name="line.67"></a>
<span class="sourceLineNo">068</span>     * Returns mode as defined in RFC-1305 which is a 3-bit integer<a name="line.68"></a>
<span class="sourceLineNo">069</span>     * whose value is indicated by the MODE_xxx parameters.<a name="line.69"></a>
<span class="sourceLineNo">070</span>     *<a name="line.70"></a>
<span class="sourceLineNo">071</span>     * @return mode as defined in RFC-1305.<a name="line.71"></a>
<span class="sourceLineNo">072</span>     */<a name="line.72"></a>
<span class="sourceLineNo">073</span>//    @Override<a name="line.73"></a>
<span class="sourceLineNo">074</span>    public int getMode()<a name="line.74"></a>
<span class="sourceLineNo">075</span>    {<a name="line.75"></a>
<span class="sourceLineNo">076</span>        return (ui(buf[MODE_INDEX]) &gt;&gt; MODE_SHIFT) &amp; 0x7;<a name="line.76"></a>
<span class="sourceLineNo">077</span>    }<a name="line.77"></a>
<span class="sourceLineNo">078</span><a name="line.78"></a>
<span class="sourceLineNo">079</span>    /***<a name="line.79"></a>
<span class="sourceLineNo">080</span>     * Return human-readable name of message mode type as described in<a name="line.80"></a>
<span class="sourceLineNo">081</span>     * RFC 1305.<a name="line.81"></a>
<span class="sourceLineNo">082</span>     * @return mode name as string.<a name="line.82"></a>
<span class="sourceLineNo">083</span>     */<a name="line.83"></a>
<span class="sourceLineNo">084</span>//    @Override<a name="line.84"></a>
<span class="sourceLineNo">085</span>    public String getModeName()<a name="line.85"></a>
<span class="sourceLineNo">086</span>    {<a name="line.86"></a>
<span class="sourceLineNo">087</span>        return NtpUtils.getModeName(getMode());<a name="line.87"></a>
<span class="sourceLineNo">088</span>    }<a name="line.88"></a>
<span class="sourceLineNo">089</span><a name="line.89"></a>
<span class="sourceLineNo">090</span>    /***<a name="line.90"></a>
<span class="sourceLineNo">091</span>     * Set mode as defined in RFC-1305.<a name="line.91"></a>
<span class="sourceLineNo">092</span>     * @param mode<a name="line.92"></a>
<span class="sourceLineNo">093</span>     */<a name="line.93"></a>
<span class="sourceLineNo">094</span>//    @Override<a name="line.94"></a>
<span class="sourceLineNo">095</span>    public void setMode(int mode)<a name="line.95"></a>
<span class="sourceLineNo">096</span>    {<a name="line.96"></a>
<span class="sourceLineNo">097</span>        buf[MODE_INDEX] = (byte) (buf[MODE_INDEX] &amp; 0xF8 | mode &amp; 0x7);<a name="line.97"></a>
<span class="sourceLineNo">098</span>    }<a name="line.98"></a>
<span class="sourceLineNo">099</span><a name="line.99"></a>
<span class="sourceLineNo">100</span>    /***<a name="line.100"></a>
<span class="sourceLineNo">101</span>     * Returns leap indicator as defined in RFC-1305 which is a two-bit code:<a name="line.101"></a>
<span class="sourceLineNo">102</span>     *  0=no warning<a name="line.102"></a>
<span class="sourceLineNo">103</span>     *  1=last minute has 61 seconds<a name="line.103"></a>
<span class="sourceLineNo">104</span>     *  2=last minute has 59 seconds<a name="line.104"></a>
<span class="sourceLineNo">105</span>     *  3=alarm condition (clock not synchronized)<a name="line.105"></a>
<span class="sourceLineNo">106</span>     *<a name="line.106"></a>
<span class="sourceLineNo">107</span>     * @return leap indicator as defined in RFC-1305.<a name="line.107"></a>
<span class="sourceLineNo">108</span>     */<a name="line.108"></a>
<span class="sourceLineNo">109</span>//    @Override<a name="line.109"></a>
<span class="sourceLineNo">110</span>    public int getLeapIndicator()<a name="line.110"></a>
<span class="sourceLineNo">111</span>    {<a name="line.111"></a>
<span class="sourceLineNo">112</span>        return (ui(buf[LI_INDEX]) &gt;&gt; LI_SHIFT) &amp; 0x3;<a name="line.112"></a>
<span class="sourceLineNo">113</span>    }<a name="line.113"></a>
<span class="sourceLineNo">114</span><a name="line.114"></a>
<span class="sourceLineNo">115</span>    /***<a name="line.115"></a>
<span class="sourceLineNo">116</span>     * Set leap indicator as defined in RFC-1305.<a name="line.116"></a>
<span class="sourceLineNo">117</span>     * @param li leap indicator.<a name="line.117"></a>
<span class="sourceLineNo">118</span>     */<a name="line.118"></a>
<span class="sourceLineNo">119</span>//    @Override<a name="line.119"></a>
<span class="sourceLineNo">120</span>    public void setLeapIndicator(int li)<a name="line.120"></a>
<span class="sourceLineNo">121</span>    {<a name="line.121"></a>
<span class="sourceLineNo">122</span>        buf[LI_INDEX] = (byte) (buf[LI_INDEX] &amp; 0x3F | ((li &amp; 0x3) &lt;&lt; LI_SHIFT));<a name="line.122"></a>
<span class="sourceLineNo">123</span>    }<a name="line.123"></a>
<span class="sourceLineNo">124</span><a name="line.124"></a>
<span class="sourceLineNo">125</span>    /***<a name="line.125"></a>
<span class="sourceLineNo">126</span>     * Returns poll interval as defined in RFC-1305, which is an eight-bit<a name="line.126"></a>
<span class="sourceLineNo">127</span>     * signed integer indicating the maximum interval between successive<a name="line.127"></a>
<span class="sourceLineNo">128</span>     * messages, in seconds to the nearest power of two (e.g. value of six<a name="line.128"></a>
<span class="sourceLineNo">129</span>     * indicates an interval of 64 seconds. The values that can appear in<a name="line.129"></a>
<span class="sourceLineNo">130</span>     * this field range from NTP_MINPOLL to NTP_MAXPOLL inclusive.<a name="line.130"></a>
<span class="sourceLineNo">131</span>     *<a name="line.131"></a>
<span class="sourceLineNo">132</span>     * @return poll interval as defined in RFC-1305.<a name="line.132"></a>
<span class="sourceLineNo">133</span>     */<a name="line.133"></a>
<span class="sourceLineNo">134</span>//    @Override<a name="line.134"></a>
<span class="sourceLineNo">135</span>    public int getPoll()<a name="line.135"></a>
<span class="sourceLineNo">136</span>    {<a name="line.136"></a>
<span class="sourceLineNo">137</span>        return buf[POLL_INDEX];<a name="line.137"></a>
<span class="sourceLineNo">138</span>    }<a name="line.138"></a>
<span class="sourceLineNo">139</span><a name="line.139"></a>
<span class="sourceLineNo">140</span>    /***<a name="line.140"></a>
<span class="sourceLineNo">141</span>     * Set poll interval as defined in RFC-1305.<a name="line.141"></a>
<span class="sourceLineNo">142</span>     *<a name="line.142"></a>
<span class="sourceLineNo">143</span>     * @param poll poll interval.<a name="line.143"></a>
<span class="sourceLineNo">144</span>     */<a name="line.144"></a>
<span class="sourceLineNo">145</span>//    @Override<a name="line.145"></a>
<span class="sourceLineNo">146</span>    public void setPoll(int poll)<a name="line.146"></a>
<span class="sourceLineNo">147</span>    {<a name="line.147"></a>
<span class="sourceLineNo">148</span>        buf[POLL_INDEX] = (byte) (poll &amp; 0xFF);<a name="line.148"></a>
<span class="sourceLineNo">149</span>    }<a name="line.149"></a>
<span class="sourceLineNo">150</span><a name="line.150"></a>
<span class="sourceLineNo">151</span>    /***<a name="line.151"></a>
<span class="sourceLineNo">152</span>     * Returns precision as defined in RFC-1305 encoded as an 8-bit signed<a name="line.152"></a>
<span class="sourceLineNo">153</span>     * integer (seconds to nearest power of two).<a name="line.153"></a>
<span class="sourceLineNo">154</span>     * Values normally range from -6 to -20.<a name="line.154"></a>
<span class="sourceLineNo">155</span>     *<a name="line.155"></a>
<span class="sourceLineNo">156</span>     * @return precision as defined in RFC-1305.<a name="line.156"></a>
<span class="sourceLineNo">157</span>     */<a name="line.157"></a>
<span class="sourceLineNo">158</span>//    @Override<a name="line.158"></a>
<span class="sourceLineNo">159</span>    public int getPrecision()<a name="line.159"></a>
<span class="sourceLineNo">160</span>    {<a name="line.160"></a>
<span class="sourceLineNo">161</span>        return buf[PRECISION_INDEX];<a name="line.161"></a>
<span class="sourceLineNo">162</span>    }<a name="line.162"></a>
<span class="sourceLineNo">163</span><a name="line.163"></a>
<span class="sourceLineNo">164</span>    /***<a name="line.164"></a>
<span class="sourceLineNo">165</span>     * Set precision as defined in RFC-1305.<a name="line.165"></a>
<span class="sourceLineNo">166</span>     * @param precision<a name="line.166"></a>
<span class="sourceLineNo">167</span>     */<a name="line.167"></a>
<span class="sourceLineNo">168</span>    public void setPrecision(int precision)<a name="line.168"></a>
<span class="sourceLineNo">169</span>    {<a name="line.169"></a>
<span class="sourceLineNo">170</span>        buf[PRECISION_INDEX] = (byte) (precision &amp; 0xFF);<a name="line.170"></a>
<span class="sourceLineNo">171</span>    }<a name="line.171"></a>
<span class="sourceLineNo">172</span><a name="line.172"></a>
<span class="sourceLineNo">173</span>    /***<a name="line.173"></a>
<span class="sourceLineNo">174</span>     * Returns NTP version number as defined in RFC-1305.<a name="line.174"></a>
<span class="sourceLineNo">175</span>     *<a name="line.175"></a>
<span class="sourceLineNo">176</span>     * @return NTP version number.<a name="line.176"></a>
<span class="sourceLineNo">177</span>     */<a name="line.177"></a>
<span class="sourceLineNo">178</span>//    @Override<a name="line.178"></a>
<span class="sourceLineNo">179</span>    public int getVersion()<a name="line.179"></a>
<span class="sourceLineNo">180</span>    {<a name="line.180"></a>
<span class="sourceLineNo">181</span>        return (ui(buf[VERSION_INDEX]) &gt;&gt; VERSION_SHIFT) &amp; 0x7;<a name="line.181"></a>
<span class="sourceLineNo">182</span>    }<a name="line.182"></a>
<span class="sourceLineNo">183</span><a name="line.183"></a>
<span class="sourceLineNo">184</span>    /***<a name="line.184"></a>
<span class="sourceLineNo">185</span>     * Set NTP version as defined in RFC-1305.<a name="line.185"></a>
<span class="sourceLineNo">186</span>     *<a name="line.186"></a>
<span class="sourceLineNo">187</span>     * @param version NTP version.<a name="line.187"></a>
<span class="sourceLineNo">188</span>     */<a name="line.188"></a>
<span class="sourceLineNo">189</span>//    @Override<a name="line.189"></a>
<span class="sourceLineNo">190</span>    public void setVersion(int version)<a name="line.190"></a>
<span class="sourceLineNo">191</span>    {<a name="line.191"></a>
<span class="sourceLineNo">192</span>        buf[VERSION_INDEX] = (byte) (buf[VERSION_INDEX] &amp; 0xC7 | ((version &amp; 0x7) &lt;&lt; VERSION_SHIFT));<a name="line.192"></a>
<span class="sourceLineNo">193</span>    }<a name="line.193"></a>
<span class="sourceLineNo">194</span><a name="line.194"></a>
<span class="sourceLineNo">195</span>    /***<a name="line.195"></a>
<span class="sourceLineNo">196</span>     * Returns Stratum as defined in RFC-1305, which indicates the stratum level<a name="line.196"></a>
<span class="sourceLineNo">197</span>     * of the local clock, with values defined as follows: 0=unspecified,<a name="line.197"></a>
<span class="sourceLineNo">198</span>     * 1=primary ref clock, and all others a secondary reference (via NTP).<a name="line.198"></a>
<span class="sourceLineNo">199</span>     *<a name="line.199"></a>
<span class="sourceLineNo">200</span>     * @return Stratum level as defined in RFC-1305.<a name="line.200"></a>
<span class="sourceLineNo">201</span>     */<a name="line.201"></a>
<span class="sourceLineNo">202</span>//    @Override<a name="line.202"></a>
<span class="sourceLineNo">203</span>    public int getStratum()<a name="line.203"></a>
<span class="sourceLineNo">204</span>    {<a name="line.204"></a>
<span class="sourceLineNo">205</span>        return ui(buf[STRATUM_INDEX]);<a name="line.205"></a>
<span class="sourceLineNo">206</span>    }<a name="line.206"></a>
<span class="sourceLineNo">207</span><a name="line.207"></a>
<span class="sourceLineNo">208</span>    /***<a name="line.208"></a>
<span class="sourceLineNo">209</span>     * Set stratum level as defined in RFC-1305.<a name="line.209"></a>
<span class="sourceLineNo">210</span>     *<a name="line.210"></a>
<span class="sourceLineNo">211</span>     * @param stratum stratum level.<a name="line.211"></a>
<span class="sourceLineNo">212</span>     */<a name="line.212"></a>
<span class="sourceLineNo">213</span>//    @Override<a name="line.213"></a>
<span class="sourceLineNo">214</span>    public void setStratum(int stratum)<a name="line.214"></a>
<span class="sourceLineNo">215</span>    {<a name="line.215"></a>
<span class="sourceLineNo">216</span>        buf[STRATUM_INDEX] = (byte) (stratum &amp; 0xFF);<a name="line.216"></a>
<span class="sourceLineNo">217</span>    }<a name="line.217"></a>
<span class="sourceLineNo">218</span><a name="line.218"></a>
<span class="sourceLineNo">219</span>    /***<a name="line.219"></a>
<span class="sourceLineNo">220</span>     * Return root delay as defined in RFC-1305, which is the total roundtrip delay<a name="line.220"></a>
<span class="sourceLineNo">221</span>     * to the primary reference source, in seconds. Values can take positive and<a name="line.221"></a>
<span class="sourceLineNo">222</span>     * negative values, depending on clock precision and skew.<a name="line.222"></a>
<span class="sourceLineNo">223</span>     *<a name="line.223"></a>
<span class="sourceLineNo">224</span>     * @return root delay as defined in RFC-1305.<a name="line.224"></a>
<span class="sourceLineNo">225</span>     */<a name="line.225"></a>
<span class="sourceLineNo">226</span>//    @Override<a name="line.226"></a>
<span class="sourceLineNo">227</span>    public int getRootDelay()<a name="line.227"></a>
<span class="sourceLineNo">228</span>    {<a name="line.228"></a>
<span class="sourceLineNo">229</span>        return getInt(ROOT_DELAY_INDEX);<a name="line.229"></a>
<span class="sourceLineNo">230</span>    }<a name="line.230"></a>
<span class="sourceLineNo">231</span><a name="line.231"></a>
<span class="sourceLineNo">232</span>    /***<a name="line.232"></a>
<span class="sourceLineNo">233</span>     * Return root delay as defined in RFC-1305 in milliseconds, which is<a name="line.233"></a>
<span class="sourceLineNo">234</span>     * the total roundtrip delay to the primary reference source, in<a name="line.234"></a>
<span class="sourceLineNo">235</span>     * seconds. Values can take positive and negative values, depending<a name="line.235"></a>
<span class="sourceLineNo">236</span>     * on clock precision and skew.<a name="line.236"></a>
<span class="sourceLineNo">237</span>     *<a name="line.237"></a>
<span class="sourceLineNo">238</span>     * @return root delay in milliseconds<a name="line.238"></a>
<span class="sourceLineNo">239</span>     */<a name="line.239"></a>
<span class="sourceLineNo">240</span>//    @Override<a name="line.240"></a>
<span class="sourceLineNo">241</span>    public double getRootDelayInMillisDouble()<a name="line.241"></a>
<span class="sourceLineNo">242</span>    {<a name="line.242"></a>
<span class="sourceLineNo">243</span>        double l = getRootDelay();<a name="line.243"></a>
<span class="sourceLineNo">244</span>        return l / 65.536;<a name="line.244"></a>
<span class="sourceLineNo">245</span>    }<a name="line.245"></a>
<span class="sourceLineNo">246</span><a name="line.246"></a>
<span class="sourceLineNo">247</span>    /***<a name="line.247"></a>
<span class="sourceLineNo">248</span>     * Returns root dispersion as defined in RFC-1305.<a name="line.248"></a>
<span class="sourceLineNo">249</span>     * @return root dispersion.<a name="line.249"></a>
<span class="sourceLineNo">250</span>     */<a name="line.250"></a>
<span class="sourceLineNo">251</span>//    @Override<a name="line.251"></a>
<span class="sourceLineNo">252</span>    public int getRootDispersion()<a name="line.252"></a>
<span class="sourceLineNo">253</span>    {<a name="line.253"></a>
<span class="sourceLineNo">254</span>        return getInt(ROOT_DISPERSION_INDEX);<a name="line.254"></a>
<span class="sourceLineNo">255</span>    }<a name="line.255"></a>
<span class="sourceLineNo">256</span><a name="line.256"></a>
<span class="sourceLineNo">257</span>    /***<a name="line.257"></a>
<span class="sourceLineNo">258</span>     * Returns root dispersion (as defined in RFC-1305) in milliseconds.<a name="line.258"></a>
<span class="sourceLineNo">259</span>     *<a name="line.259"></a>
<span class="sourceLineNo">260</span>     * @return root dispersion in milliseconds<a name="line.260"></a>
<span class="sourceLineNo">261</span>     */<a name="line.261"></a>
<span class="sourceLineNo">262</span>//    @Override<a name="line.262"></a>
<span class="sourceLineNo">263</span>    public long getRootDispersionInMillis()<a name="line.263"></a>
<span class="sourceLineNo">264</span>    {<a name="line.264"></a>
<span class="sourceLineNo">265</span>        long l = getRootDispersion();<a name="line.265"></a>
<span class="sourceLineNo">266</span>        return (l * 1000) / 65536L;<a name="line.266"></a>
<span class="sourceLineNo">267</span>    }<a name="line.267"></a>
<span class="sourceLineNo">268</span><a name="line.268"></a>
<span class="sourceLineNo">269</span>    /***<a name="line.269"></a>
<span class="sourceLineNo">270</span>     * Returns root dispersion (as defined in RFC-1305) in milliseconds<a name="line.270"></a>
<span class="sourceLineNo">271</span>     * as double precision value.<a name="line.271"></a>
<span class="sourceLineNo">272</span>     *<a name="line.272"></a>
<span class="sourceLineNo">273</span>     * @return root dispersion in milliseconds<a name="line.273"></a>
<span class="sourceLineNo">274</span>     */<a name="line.274"></a>
<span class="sourceLineNo">275</span>//    @Override<a name="line.275"></a>
<span class="sourceLineNo">276</span>    public double getRootDispersionInMillisDouble()<a name="line.276"></a>
<span class="sourceLineNo">277</span>    {<a name="line.277"></a>
<span class="sourceLineNo">278</span>        double l = getRootDispersion();<a name="line.278"></a>
<span class="sourceLineNo">279</span>        return l / 65.536;<a name="line.279"></a>
<span class="sourceLineNo">280</span>    }<a name="line.280"></a>
<span class="sourceLineNo">281</span><a name="line.281"></a>
<span class="sourceLineNo">282</span>    /***<a name="line.282"></a>
<span class="sourceLineNo">283</span>     * Set reference clock identifier field with 32-bit unsigned integer value.<a name="line.283"></a>
<span class="sourceLineNo">284</span>     * See RFC-1305 for description.<a name="line.284"></a>
<span class="sourceLineNo">285</span>     *<a name="line.285"></a>
<span class="sourceLineNo">286</span>     * @param refId reference clock identifier.<a name="line.286"></a>
<span class="sourceLineNo">287</span>     */<a name="line.287"></a>
<span class="sourceLineNo">288</span>//    @Override<a name="line.288"></a>
<span class="sourceLineNo">289</span>    public void setReferenceId(int refId)<a name="line.289"></a>
<span class="sourceLineNo">290</span>    {<a name="line.290"></a>
<span class="sourceLineNo">291</span>        for (int i = 3; i &gt;= 0; i--) {<a name="line.291"></a>
<span class="sourceLineNo">292</span>            buf[REFERENCE_ID_INDEX + i] = (byte) (refId &amp; 0xff);<a name="line.292"></a>
<span class="sourceLineNo">293</span>            refId &gt;&gt;&gt;= 8; // shift right one-byte<a name="line.293"></a>
<span class="sourceLineNo">294</span>        }<a name="line.294"></a>
<span class="sourceLineNo">295</span>    }<a name="line.295"></a>
<span class="sourceLineNo">296</span><a name="line.296"></a>
<span class="sourceLineNo">297</span>    /***<a name="line.297"></a>
<span class="sourceLineNo">298</span>     * Returns the reference id as defined in RFC-1305, which is<a name="line.298"></a>
<span class="sourceLineNo">299</span>     * a 32-bit integer whose value is dependent on several criteria.<a name="line.299"></a>
<span class="sourceLineNo">300</span>     *<a name="line.300"></a>
<span class="sourceLineNo">301</span>     * @return the reference id as defined in RFC-1305.<a name="line.301"></a>
<span class="sourceLineNo">302</span>     */<a name="line.302"></a>
<span class="sourceLineNo">303</span>//    @Override<a name="line.303"></a>
<span class="sourceLineNo">304</span>    public int getReferenceId()<a name="line.304"></a>
<span class="sourceLineNo">305</span>    {<a name="line.305"></a>
<span class="sourceLineNo">306</span>        return getInt(REFERENCE_ID_INDEX);<a name="line.306"></a>
<span class="sourceLineNo">307</span>    }<a name="line.307"></a>
<span class="sourceLineNo">308</span><a name="line.308"></a>
<span class="sourceLineNo">309</span>    /***<a name="line.309"></a>
<span class="sourceLineNo">310</span>     * Returns the reference id string. String cannot be null but<a name="line.310"></a>
<span class="sourceLineNo">311</span>     * value is dependent on the version of the NTP spec supported<a name="line.311"></a>
<span class="sourceLineNo">312</span>     * and stratum level. Value can be an empty string, clock type string,<a name="line.312"></a>
<span class="sourceLineNo">313</span>     * IP address, or a hex string.<a name="line.313"></a>
<span class="sourceLineNo">314</span>     *<a name="line.314"></a>
<span class="sourceLineNo">315</span>     * @return the reference id string.<a name="line.315"></a>
<span class="sourceLineNo">316</span>     */<a name="line.316"></a>
<span class="sourceLineNo">317</span>//    @Override<a name="line.317"></a>
<span class="sourceLineNo">318</span>    public String getReferenceIdString()<a name="line.318"></a>
<span class="sourceLineNo">319</span>    {<a name="line.319"></a>
<span class="sourceLineNo">320</span>        int version = getVersion();<a name="line.320"></a>
<span class="sourceLineNo">321</span>        int stratum = getStratum();<a name="line.321"></a>
<span class="sourceLineNo">322</span>        if (version == VERSION_3 || version == VERSION_4) {<a name="line.322"></a>
<span class="sourceLineNo">323</span>            if (stratum == 0 || stratum == 1) {<a name="line.323"></a>
<span class="sourceLineNo">324</span>                return idAsString(); // 4-character ASCII string (e.g. GPS, USNO)<a name="line.324"></a>
<span class="sourceLineNo">325</span>            }<a name="line.325"></a>
<span class="sourceLineNo">326</span>            // in NTPv4 servers this is latest transmit timestamp of ref source<a name="line.326"></a>
<span class="sourceLineNo">327</span>            if (version == VERSION_4) {<a name="line.327"></a>
<span class="sourceLineNo">328</span>                return idAsHex();<a name="line.328"></a>
<span class="sourceLineNo">329</span>            }<a name="line.329"></a>
<span class="sourceLineNo">330</span>        }<a name="line.330"></a>
<span class="sourceLineNo">331</span><a name="line.331"></a>
<span class="sourceLineNo">332</span>        // Stratum 2 and higher this is a four-octet IPv4 address<a name="line.332"></a>
<span class="sourceLineNo">333</span>        // of the primary reference host.<a name="line.333"></a>
<span class="sourceLineNo">334</span>        if (stratum &gt;= 2) {<a name="line.334"></a>
<span class="sourceLineNo">335</span>            return idAsIPAddress();<a name="line.335"></a>
<span class="sourceLineNo">336</span>        }<a name="line.336"></a>
<span class="sourceLineNo">337</span>        return idAsHex();<a name="line.337"></a>
<span class="sourceLineNo">338</span>    }<a name="line.338"></a>
<span class="sourceLineNo">339</span><a name="line.339"></a>
<span class="sourceLineNo">340</span>    /***<a name="line.340"></a>
<span class="sourceLineNo">341</span>     * Returns Reference id as dotted IP address.<a name="line.341"></a>
<span class="sourceLineNo">342</span>     * @return refId as IP address string.<a name="line.342"></a>
<span class="sourceLineNo">343</span>     */<a name="line.343"></a>
<span class="sourceLineNo">344</span>    private String idAsIPAddress()<a name="line.344"></a>
<span class="sourceLineNo">345</span>    {<a name="line.345"></a>
<span class="sourceLineNo">346</span>        return ui(buf[REFERENCE_ID_INDEX]) + "." +<a name="line.346"></a>
<span class="sourceLineNo">347</span>                ui(buf[REFERENCE_ID_INDEX + 1]) + "." +<a name="line.347"></a>
<span class="sourceLineNo">348</span>                ui(buf[REFERENCE_ID_INDEX + 2]) + "." +<a name="line.348"></a>
<span class="sourceLineNo">349</span>                ui(buf[REFERENCE_ID_INDEX + 3]);<a name="line.349"></a>
<span class="sourceLineNo">350</span>    }<a name="line.350"></a>
<span class="sourceLineNo">351</span><a name="line.351"></a>
<span class="sourceLineNo">352</span>    private String idAsString()<a name="line.352"></a>
<span class="sourceLineNo">353</span>    {<a name="line.353"></a>
<span class="sourceLineNo">354</span>        StringBuilder id = new StringBuilder();<a name="line.354"></a>
<span class="sourceLineNo">355</span>        for (int i = 0; i &lt;= 3; i++) {<a name="line.355"></a>
<span class="sourceLineNo">356</span>            char c = (char) buf[REFERENCE_ID_INDEX + i];<a name="line.356"></a>
<span class="sourceLineNo">357</span>            if (c == 0) {  // 0-terminated string<a name="line.357"></a>
<span class="sourceLineNo">358</span>                break;<a name="line.358"></a>
<span class="sourceLineNo">359</span>            }<a name="line.359"></a>
<span class="sourceLineNo">360</span>            id.append(c);<a name="line.360"></a>
<span class="sourceLineNo">361</span>        }<a name="line.361"></a>
<span class="sourceLineNo">362</span>        return id.toString();<a name="line.362"></a>
<span class="sourceLineNo">363</span>    }<a name="line.363"></a>
<span class="sourceLineNo">364</span><a name="line.364"></a>
<span class="sourceLineNo">365</span>    private String idAsHex()<a name="line.365"></a>
<span class="sourceLineNo">366</span>    {<a name="line.366"></a>
<span class="sourceLineNo">367</span>        return Integer.toHexString(getReferenceId());<a name="line.367"></a>
<span class="sourceLineNo">368</span>    }<a name="line.368"></a>
<span class="sourceLineNo">369</span><a name="line.369"></a>
<span class="sourceLineNo">370</span>    /***<a name="line.370"></a>
<span class="sourceLineNo">371</span>     * Returns the transmit timestamp as defined in RFC-1305.<a name="line.371"></a>
<span class="sourceLineNo">372</span>     *<a name="line.372"></a>
<span class="sourceLineNo">373</span>     * @return the transmit timestamp as defined in RFC-1305.<a name="line.373"></a>
<span class="sourceLineNo">374</span>     * Never returns a null object.<a name="line.374"></a>
<span class="sourceLineNo">375</span>     */<a name="line.375"></a>
<span class="sourceLineNo">376</span>//    @Override<a name="line.376"></a>
<span class="sourceLineNo">377</span>    public TimeStamp getTransmitTimeStamp()<a name="line.377"></a>
<span class="sourceLineNo">378</span>    {<a name="line.378"></a>
<span class="sourceLineNo">379</span>        return getTimestamp(TRANSMIT_TIMESTAMP_INDEX);<a name="line.379"></a>
<span class="sourceLineNo">380</span>    }<a name="line.380"></a>
<span class="sourceLineNo">381</span><a name="line.381"></a>
<span class="sourceLineNo">382</span>    /***<a name="line.382"></a>
<span class="sourceLineNo">383</span>     * Set transmit time with NTP timestamp.<a name="line.383"></a>
<span class="sourceLineNo">384</span>     * If &lt;code&gt;ts&lt;/code&gt; is null then zero time is used.<a name="line.384"></a>
<span class="sourceLineNo">385</span>     *<a name="line.385"></a>
<span class="sourceLineNo">386</span>     * @param ts NTP timestamp<a name="line.386"></a>
<span class="sourceLineNo">387</span>     */<a name="line.387"></a>
<span class="sourceLineNo">388</span>//    @Override<a name="line.388"></a>
<span class="sourceLineNo">389</span>    public void setTransmitTime(TimeStamp ts)<a name="line.389"></a>
<span class="sourceLineNo">390</span>    {<a name="line.390"></a>
<span class="sourceLineNo">391</span>        setTimestamp(TRANSMIT_TIMESTAMP_INDEX, ts);<a name="line.391"></a>
<span class="sourceLineNo">392</span>    }<a name="line.392"></a>
<span class="sourceLineNo">393</span><a name="line.393"></a>
<span class="sourceLineNo">394</span>    /***<a name="line.394"></a>
<span class="sourceLineNo">395</span>     * Set originate timestamp given NTP TimeStamp object.<a name="line.395"></a>
<span class="sourceLineNo">396</span>     * If &lt;code&gt;ts&lt;/code&gt; is null then zero time is used.<a name="line.396"></a>
<span class="sourceLineNo">397</span>     *<a name="line.397"></a>
<span class="sourceLineNo">398</span>     * @param ts NTP timestamp<a name="line.398"></a>
<span class="sourceLineNo">399</span>     */<a name="line.399"></a>
<span class="sourceLineNo">400</span>//    @Override<a name="line.400"></a>
<span class="sourceLineNo">401</span>    public void setOriginateTimeStamp(TimeStamp ts)<a name="line.401"></a>
<span class="sourceLineNo">402</span>    {<a name="line.402"></a>
<span class="sourceLineNo">403</span>        setTimestamp(ORIGINATE_TIMESTAMP_INDEX, ts);<a name="line.403"></a>
<span class="sourceLineNo">404</span>    }<a name="line.404"></a>
<span class="sourceLineNo">405</span><a name="line.405"></a>
<span class="sourceLineNo">406</span>    /***<a name="line.406"></a>
<span class="sourceLineNo">407</span>     * Returns the originate time as defined in RFC-1305.<a name="line.407"></a>
<span class="sourceLineNo">408</span>     *<a name="line.408"></a>
<span class="sourceLineNo">409</span>     * @return the originate time.<a name="line.409"></a>
<span class="sourceLineNo">410</span>     * Never returns null.<a name="line.410"></a>
<span class="sourceLineNo">411</span>     */<a name="line.411"></a>
<span class="sourceLineNo">412</span>//    @Override<a name="line.412"></a>
<span class="sourceLineNo">413</span>    public TimeStamp getOriginateTimeStamp()<a name="line.413"></a>
<span class="sourceLineNo">414</span>    {<a name="line.414"></a>
<span class="sourceLineNo">415</span>        return getTimestamp(ORIGINATE_TIMESTAMP_INDEX);<a name="line.415"></a>
<span class="sourceLineNo">416</span>    }<a name="line.416"></a>
<span class="sourceLineNo">417</span><a name="line.417"></a>
<span class="sourceLineNo">418</span>    /***<a name="line.418"></a>
<span class="sourceLineNo">419</span>     * Returns the reference time as defined in RFC-1305.<a name="line.419"></a>
<span class="sourceLineNo">420</span>     *<a name="line.420"></a>
<span class="sourceLineNo">421</span>     * @return the reference time as &lt;code&gt;TimeStamp&lt;/code&gt; object.<a name="line.421"></a>
<span class="sourceLineNo">422</span>     * Never returns null.<a name="line.422"></a>
<span class="sourceLineNo">423</span>     */<a name="line.423"></a>
<span class="sourceLineNo">424</span>//    @Override<a name="line.424"></a>
<span class="sourceLineNo">425</span>    public TimeStamp getReferenceTimeStamp()<a name="line.425"></a>
<span class="sourceLineNo">426</span>    {<a name="line.426"></a>
<span class="sourceLineNo">427</span>        return getTimestamp(REFERENCE_TIMESTAMP_INDEX);<a name="line.427"></a>
<span class="sourceLineNo">428</span>    }<a name="line.428"></a>
<span class="sourceLineNo">429</span><a name="line.429"></a>
<span class="sourceLineNo">430</span>    /***<a name="line.430"></a>
<span class="sourceLineNo">431</span>     * Set Reference time with NTP timestamp. If &lt;code&gt;ts&lt;/code&gt; is null<a name="line.431"></a>
<span class="sourceLineNo">432</span>     * then zero time is used.<a name="line.432"></a>
<span class="sourceLineNo">433</span>     *<a name="line.433"></a>
<span class="sourceLineNo">434</span>     * @param ts NTP timestamp<a name="line.434"></a>
<span class="sourceLineNo">435</span>     */<a name="line.435"></a>
<span class="sourceLineNo">436</span>//    @Override<a name="line.436"></a>
<span class="sourceLineNo">437</span>    public void setReferenceTime(TimeStamp ts)<a name="line.437"></a>
<span class="sourceLineNo">438</span>    {<a name="line.438"></a>
<span class="sourceLineNo">439</span>        setTimestamp(REFERENCE_TIMESTAMP_INDEX, ts);<a name="line.439"></a>
<span class="sourceLineNo">440</span>    }<a name="line.440"></a>
<span class="sourceLineNo">441</span><a name="line.441"></a>
<span class="sourceLineNo">442</span>    /***<a name="line.442"></a>
<span class="sourceLineNo">443</span>     * Returns receive timestamp as defined in RFC-1305.<a name="line.443"></a>
<span class="sourceLineNo">444</span>     *<a name="line.444"></a>
<span class="sourceLineNo">445</span>     * @return the receive time.<a name="line.445"></a>
<span class="sourceLineNo">446</span>     * Never returns null.<a name="line.446"></a>
<span class="sourceLineNo">447</span>     */<a name="line.447"></a>
<span class="sourceLineNo">448</span>//    @Override<a name="line.448"></a>
<span class="sourceLineNo">449</span>    public TimeStamp getReceiveTimeStamp()<a name="line.449"></a>
<span class="sourceLineNo">450</span>    {<a name="line.450"></a>
<span class="sourceLineNo">451</span>        return getTimestamp(RECEIVE_TIMESTAMP_INDEX);<a name="line.451"></a>
<span class="sourceLineNo">452</span>    }<a name="line.452"></a>
<span class="sourceLineNo">453</span><a name="line.453"></a>
<span class="sourceLineNo">454</span>    /***<a name="line.454"></a>
<span class="sourceLineNo">455</span>     * Set receive timestamp given NTP TimeStamp object.<a name="line.455"></a>
<span class="sourceLineNo">456</span>     * If &lt;code&gt;ts&lt;/code&gt; is null then zero time is used.<a name="line.456"></a>
<span class="sourceLineNo">457</span>     *<a name="line.457"></a>
<span class="sourceLineNo">458</span>     * @param ts timestamp<a name="line.458"></a>
<span class="sourceLineNo">459</span>     */<a name="line.459"></a>
<span class="sourceLineNo">460</span>//    @Override<a name="line.460"></a>
<span class="sourceLineNo">461</span>    public void setReceiveTimeStamp(TimeStamp ts)<a name="line.461"></a>
<span class="sourceLineNo">462</span>    {<a name="line.462"></a>
<span class="sourceLineNo">463</span>        setTimestamp(RECEIVE_TIMESTAMP_INDEX, ts);<a name="line.463"></a>
<span class="sourceLineNo">464</span>    }<a name="line.464"></a>
<span class="sourceLineNo">465</span><a name="line.465"></a>
<span class="sourceLineNo">466</span>    /***<a name="line.466"></a>
<span class="sourceLineNo">467</span>     * Return type of time packet. The values (e.g. NTP, TIME, ICMP, ...)<a name="line.467"></a>
<span class="sourceLineNo">468</span>     * correspond to the protocol used to obtain the timing information.<a name="line.468"></a>
<span class="sourceLineNo">469</span>     *<a name="line.469"></a>
<span class="sourceLineNo">470</span>     * @return packet type string identifier which in this case is "NTP".<a name="line.470"></a>
<span class="sourceLineNo">471</span>     */<a name="line.471"></a>
<span class="sourceLineNo">472</span>//    @Override<a name="line.472"></a>
<span class="sourceLineNo">473</span>    public String getType()<a name="line.473"></a>
<span class="sourceLineNo">474</span>    {<a name="line.474"></a>
<span class="sourceLineNo">475</span>        return "NTP";<a name="line.475"></a>
<span class="sourceLineNo">476</span>    }<a name="line.476"></a>
<span class="sourceLineNo">477</span><a name="line.477"></a>
<span class="sourceLineNo">478</span>    /***<a name="line.478"></a>
<span class="sourceLineNo">479</span>     * @return 4 bytes as 32-bit int<a name="line.479"></a>
<span class="sourceLineNo">480</span>     */<a name="line.480"></a>
<span class="sourceLineNo">481</span>    private int getInt(int index)<a name="line.481"></a>
<span class="sourceLineNo">482</span>    {<a name="line.482"></a>
<span class="sourceLineNo">483</span>        int i = ui(buf[index]) &lt;&lt; 24 |<a name="line.483"></a>
<span class="sourceLineNo">484</span>                ui(buf[index + 1]) &lt;&lt; 16 |<a name="line.484"></a>
<span class="sourceLineNo">485</span>                ui(buf[index + 2]) &lt;&lt; 8 |<a name="line.485"></a>
<span class="sourceLineNo">486</span>                ui(buf[index + 3]);<a name="line.486"></a>
<span class="sourceLineNo">487</span><a name="line.487"></a>
<span class="sourceLineNo">488</span>        return i;<a name="line.488"></a>
<span class="sourceLineNo">489</span>    }<a name="line.489"></a>
<span class="sourceLineNo">490</span><a name="line.490"></a>
<span class="sourceLineNo">491</span>    /***<a name="line.491"></a>
<span class="sourceLineNo">492</span>     * Get NTP Timestamp at specified starting index.<a name="line.492"></a>
<span class="sourceLineNo">493</span>     *<a name="line.493"></a>
<span class="sourceLineNo">494</span>     * @param index index into data array<a name="line.494"></a>
<span class="sourceLineNo">495</span>     * @return TimeStamp object for 64 bits starting at index<a name="line.495"></a>
<span class="sourceLineNo">496</span>     */<a name="line.496"></a>
<span class="sourceLineNo">497</span>    private TimeStamp getTimestamp(int index)<a name="line.497"></a>
<span class="sourceLineNo">498</span>    {<a name="line.498"></a>
<span class="sourceLineNo">499</span>        return new TimeStamp(getLong(index));<a name="line.499"></a>
<span class="sourceLineNo">500</span>    }<a name="line.500"></a>
<span class="sourceLineNo">501</span><a name="line.501"></a>
<span class="sourceLineNo">502</span>    /***<a name="line.502"></a>
<span class="sourceLineNo">503</span>     * Get Long value represented by bits starting at specified index.<a name="line.503"></a>
<span class="sourceLineNo">504</span>     *<a name="line.504"></a>
<span class="sourceLineNo">505</span>     * @return 8 bytes as 64-bit long<a name="line.505"></a>
<span class="sourceLineNo">506</span>     */<a name="line.506"></a>
<span class="sourceLineNo">507</span>    private long getLong(int index)<a name="line.507"></a>
<span class="sourceLineNo">508</span>    {<a name="line.508"></a>
<span class="sourceLineNo">509</span>        long i = ul(buf[index]) &lt;&lt; 56 |<a name="line.509"></a>
<span class="sourceLineNo">510</span>                ul(buf[index + 1]) &lt;&lt; 48 |<a name="line.510"></a>
<span class="sourceLineNo">511</span>                ul(buf[index + 2]) &lt;&lt; 40 |<a name="line.511"></a>
<span class="sourceLineNo">512</span>                ul(buf[index + 3]) &lt;&lt; 32 |<a name="line.512"></a>
<span class="sourceLineNo">513</span>                ul(buf[index + 4]) &lt;&lt; 24 |<a name="line.513"></a>
<span class="sourceLineNo">514</span>                ul(buf[index + 5]) &lt;&lt; 16 |<a name="line.514"></a>
<span class="sourceLineNo">515</span>                ul(buf[index + 6]) &lt;&lt; 8 |<a name="line.515"></a>
<span class="sourceLineNo">516</span>                ul(buf[index + 7]);<a name="line.516"></a>
<span class="sourceLineNo">517</span>        return i;<a name="line.517"></a>
<span class="sourceLineNo">518</span>    }<a name="line.518"></a>
<span class="sourceLineNo">519</span><a name="line.519"></a>
<span class="sourceLineNo">520</span>    /***<a name="line.520"></a>
<span class="sourceLineNo">521</span>     * Sets the NTP timestamp at the given array index.<a name="line.521"></a>
<span class="sourceLineNo">522</span>     *<a name="line.522"></a>
<span class="sourceLineNo">523</span>     * @param index index into the byte array.<a name="line.523"></a>
<span class="sourceLineNo">524</span>     * @param t TimeStamp.<a name="line.524"></a>
<span class="sourceLineNo">525</span>     */<a name="line.525"></a>
<span class="sourceLineNo">526</span>    private void setTimestamp(int index, TimeStamp t)<a name="line.526"></a>
<span class="sourceLineNo">527</span>    {<a name="line.527"></a>
<span class="sourceLineNo">528</span>        long ntpTime = (t == null) ? 0 : t.ntpValue();<a name="line.528"></a>
<span class="sourceLineNo">529</span>        // copy 64-bits from Long value into 8 x 8-bit bytes of array<a name="line.529"></a>
<span class="sourceLineNo">530</span>        // one byte at a time shifting 8-bits for each position.<a name="line.530"></a>
<span class="sourceLineNo">531</span>        for (int i = 7; i &gt;= 0; i--) {<a name="line.531"></a>
<span class="sourceLineNo">532</span>            buf[index + i] = (byte) (ntpTime &amp; 0xFF);<a name="line.532"></a>
<span class="sourceLineNo">533</span>            ntpTime &gt;&gt;&gt;= 8; // shift to next byte<a name="line.533"></a>
<span class="sourceLineNo">534</span>        }<a name="line.534"></a>
<span class="sourceLineNo">535</span>        // buf[index] |= 0x80;  // only set if 1900 baseline....<a name="line.535"></a>
<span class="sourceLineNo">536</span>    }<a name="line.536"></a>
<span class="sourceLineNo">537</span><a name="line.537"></a>
<span class="sourceLineNo">538</span>    /***<a name="line.538"></a>
<span class="sourceLineNo">539</span>     * Returns the datagram packet with the NTP details already filled in.<a name="line.539"></a>
<span class="sourceLineNo">540</span>     *<a name="line.540"></a>
<span class="sourceLineNo">541</span>     * @return a datagram packet.<a name="line.541"></a>
<span class="sourceLineNo">542</span>     */<a name="line.542"></a>
<span class="sourceLineNo">543</span>//    @Override<a name="line.543"></a>
<span class="sourceLineNo">544</span>    public synchronized DatagramPacket getDatagramPacket()<a name="line.544"></a>
<span class="sourceLineNo">545</span>    {<a name="line.545"></a>
<span class="sourceLineNo">546</span>        if (dp == null) {<a name="line.546"></a>
<span class="sourceLineNo">547</span>            dp = new DatagramPacket(buf, buf.length);<a name="line.547"></a>
<span class="sourceLineNo">548</span>            dp.setPort(NTP_PORT);<a name="line.548"></a>
<span class="sourceLineNo">549</span>        }<a name="line.549"></a>
<span class="sourceLineNo">550</span>        return dp;<a name="line.550"></a>
<span class="sourceLineNo">551</span>    }<a name="line.551"></a>
<span class="sourceLineNo">552</span><a name="line.552"></a>
<span class="sourceLineNo">553</span>    /***<a name="line.553"></a>
<span class="sourceLineNo">554</span>     * Set the contents of this object from source datagram packet.<a name="line.554"></a>
<span class="sourceLineNo">555</span>     *<a name="line.555"></a>
<span class="sourceLineNo">556</span>     * @param srcDp source DatagramPacket to copy contents from.<a name="line.556"></a>
<span class="sourceLineNo">557</span>     */<a name="line.557"></a>
<span class="sourceLineNo">558</span>//    @Override<a name="line.558"></a>
<span class="sourceLineNo">559</span>    public void setDatagramPacket(DatagramPacket srcDp)<a name="line.559"></a>
<span class="sourceLineNo">560</span>    {<a name="line.560"></a>
<span class="sourceLineNo">561</span>        byte[] incomingBuf = srcDp.getData();<a name="line.561"></a>
<span class="sourceLineNo">562</span>        int len = srcDp.getLength();<a name="line.562"></a>
<span class="sourceLineNo">563</span>        if (len &gt; buf.length) {<a name="line.563"></a>
<span class="sourceLineNo">564</span>            len = buf.length;<a name="line.564"></a>
<span class="sourceLineNo">565</span>        }<a name="line.565"></a>
<span class="sourceLineNo">566</span><a name="line.566"></a>
<span class="sourceLineNo">567</span>        System.arraycopy(incomingBuf, 0, buf, 0, len);<a name="line.567"></a>
<span class="sourceLineNo">568</span>    }<a name="line.568"></a>
<span class="sourceLineNo">569</span><a name="line.569"></a>
<span class="sourceLineNo">570</span>    /***<a name="line.570"></a>
<span class="sourceLineNo">571</span>     * Convert byte to unsigned integer.<a name="line.571"></a>
<span class="sourceLineNo">572</span>     * Java only has signed types so we have to do<a name="line.572"></a>
<span class="sourceLineNo">573</span>     * more work to get unsigned ops.<a name="line.573"></a>
<span class="sourceLineNo">574</span>     *<a name="line.574"></a>
<span class="sourceLineNo">575</span>     * @param b<a name="line.575"></a>
<span class="sourceLineNo">576</span>     * @return unsigned int value of byte<a name="line.576"></a>
<span class="sourceLineNo">577</span>     */<a name="line.577"></a>
<span class="sourceLineNo">578</span>    protected final static int ui(byte b)<a name="line.578"></a>
<span class="sourceLineNo">579</span>    {<a name="line.579"></a>
<span class="sourceLineNo">580</span>        int i = b &amp; 0xFF;<a name="line.580"></a>
<span class="sourceLineNo">581</span>        return i;<a name="line.581"></a>
<span class="sourceLineNo">582</span>    }<a name="line.582"></a>
<span class="sourceLineNo">583</span><a name="line.583"></a>
<span class="sourceLineNo">584</span>    /***<a name="line.584"></a>
<span class="sourceLineNo">585</span>     * Convert byte to unsigned long.<a name="line.585"></a>
<span class="sourceLineNo">586</span>     * Java only has signed types so we have to do<a name="line.586"></a>
<span class="sourceLineNo">587</span>     * more work to get unsigned ops<a name="line.587"></a>
<span class="sourceLineNo">588</span>     *<a name="line.588"></a>
<span class="sourceLineNo">589</span>     * @param b<a name="line.589"></a>
<span class="sourceLineNo">590</span>     * @return unsigned long value of byte<a name="line.590"></a>
<span class="sourceLineNo">591</span>     */<a name="line.591"></a>
<span class="sourceLineNo">592</span>    protected final static long ul(byte b)<a name="line.592"></a>
<span class="sourceLineNo">593</span>    {<a name="line.593"></a>
<span class="sourceLineNo">594</span>        long i = b &amp; 0xFF;<a name="line.594"></a>
<span class="sourceLineNo">595</span>        return i;<a name="line.595"></a>
<span class="sourceLineNo">596</span>    }<a name="line.596"></a>
<span class="sourceLineNo">597</span><a name="line.597"></a>
<span class="sourceLineNo">598</span>    /***<a name="line.598"></a>
<span class="sourceLineNo">599</span>     * Returns details of NTP packet as a string.<a name="line.599"></a>
<span class="sourceLineNo">600</span>     *<a name="line.600"></a>
<span class="sourceLineNo">601</span>     * @return details of NTP packet as a string.<a name="line.601"></a>
<span class="sourceLineNo">602</span>     */<a name="line.602"></a>
<span class="sourceLineNo">603</span>    @Override<a name="line.603"></a>
<span class="sourceLineNo">604</span>    public String toString()<a name="line.604"></a>
<span class="sourceLineNo">605</span>    {<a name="line.605"></a>
<span class="sourceLineNo">606</span>        return "[" +<a name="line.606"></a>
<span class="sourceLineNo">607</span>                "version:" + getVersion() +<a name="line.607"></a>
<span class="sourceLineNo">608</span>                ", mode:" + getMode() +<a name="line.608"></a>
<span class="sourceLineNo">609</span>                ", poll:" + getPoll() +<a name="line.609"></a>
<span class="sourceLineNo">610</span>                ", precision:" + getPrecision() +<a name="line.610"></a>
<span class="sourceLineNo">611</span>                ", delay:" + getRootDelay() +<a name="line.611"></a>
<span class="sourceLineNo">612</span>                ", dispersion(ms):" + getRootDispersionInMillisDouble() +<a name="line.612"></a>
<span class="sourceLineNo">613</span>                ", id:" + getReferenceIdString() +<a name="line.613"></a>
<span class="sourceLineNo">614</span>                ", xmitTime:" + getTransmitTimeStamp().toDateString() +<a name="line.614"></a>
<span class="sourceLineNo">615</span>                " ]";<a name="line.615"></a>
<span class="sourceLineNo">616</span>    }<a name="line.616"></a>
<span class="sourceLineNo">617</span><a name="line.617"></a>
<span class="sourceLineNo">618</span>}<a name="line.618"></a>




























































</pre>
</div>
</body>
</html>
